HOW TO: Collect system logs on macOS Sierra and later

With macOS Sierra, Apple introduced a new way of creating and storing logs, which is called "unified logging". This implies that a lot of logs are not stored anymore in the file "System.log" as they used to be, but they are stored in a database. The "system.log" file still exists, but there is just much less info in it.


Using Terminal

Collect Logs with Terminal

Start the application "Terminal" (found in the folder "/Applications/Utilities/"). This window will show up:


Then type in this window something like this:

sudo log collect --output ~/Documents/logcoll.logarchive --start '2020-01-10'

Note that you will have to modify the start date to include the day you had issues, so modify what follows "start", it is written in the format year-month-day. Once you have set the day, hit carriage return. Terminal will ask for an admin password. When it completes successfully, it should show you this message:

Archive successfully written to /Users/admin/Documents/logcoll.logarchive


Zip the file

The file created can be quite large, so it is recommended to zip it before sending it to us. For that:

  • go in your user "Documents" folder,
  • locate the file "logcoll.logarchive",
  • right-click on it and select the menu "Compress "logcoll.logarchive"
  • This will create a file with the .zip extension, which should be smaller.


Send us the file

The support desk has a limit of 7MB so you won't be able to send it to the support desk directly (these files are quite large). To send your files you can either use:

  • Your own FTP. Just send us the credentials, so we can have access to it.
  • A file sharing system (such as Google Drive, Drop Box, WeTransfer,...). Send us the link to download the file.
  • Our FTP. Contact the support team to get the credentials so you can upload a file to our FTP.
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